
Home  Forums  Rules  Articles  diyAudio Store  Gallery  Blogs  Register  Donations  FAQ  Calendar  Search  Today's Posts  Mark Forums Read  Search 
Solid State Talk all about solid state amplification. 

Please consider donating to help us continue to serve you.
Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving 

Thread Tools  Search this Thread 
4th August 2009, 10:37 PM  #21  
diyAudio Member

Quote:
Are current conveyors available as ICs?
__________________
The Devil is not so terrible as his math model is! 

4th August 2009, 10:46 PM  #22 
diyAudio Member

__________________
The Devil is not so terrible as his math model is! 
4th August 2009, 11:01 PM  #23 
diyAudio Member
Join Date: Jun 2004
Location: Warsaw

Actually i am not concious of any current convoyour IC.
edit: maybe you may use a current feedback amplifier with noninverting input grouded As for opamp stability, no opamp likes voltage gain below one, especially fast video opamps. A capacitor in feedback loop is often mandatory. I suggest you studdied circuits designed for fast photodiode amplifiers, they serve the same purpose which is converting current to voltage and there is much research there, for example on how to tailor feedback capacitor for macimum gain*bandwidth. 
4th August 2009, 11:08 PM  #24 
Banned
Join Date: Apr 2005
Location: Stockholm

Wavebourn,
just like in audio, overall negative feedback is really a nuisance here. 
4th August 2009, 11:58 PM  #25  
diyAudio Member

Quote:
The first one is a current to voltage converter, with close to zero input resistance to prevent crosstalk between signals I measure. The second one, is a maximumpossiblegain amp with logarythmic overdrive function; the 3'd one has a positive feedback, a flipflop with well defined hysteresis to shape output and prevent oscillations. Do you know what are you talking about, Lumba?
__________________
The Devil is not so terrible as his math model is! 

5th August 2009, 07:06 AM  #26 
diyAudio Member
Join Date: Apr 2002
Location: Prague

'Which overall negative feedback?'
That in the 1st opamp e.g., the I/V converter. The FB ratio is defined by Zol/R1 
5th August 2009, 08:35 AM  #27  
diyAudio Member

Quote:
__________________
The Devil is not so terrible as his math model is! 

5th August 2009, 08:38 AM  #28  
diyAudio Member

Quote:
Thanks!
__________________
The Devil is not so terrible as his math model is! 

5th August 2009, 08:58 AM  #29 
diyAudio Member
Join Date: Dec 2002
Location: Sydney, Australia

What you specified you want in the first post and what you are drawing don't seem to relate.
What exactly is the function required? 
5th August 2009, 09:12 AM  #30 
diyAudio Member

I need to compare 2 currents when they flow in different directions, if to say strictly. Both may swing between 20 mA to +20 mA, up to 1 MHz frequency.
__________________
The Devil is not so terrible as his math model is! 
Thread Tools  Search this Thread 


Similar Threads  
Thread  Thread Starter  Forum  Replies  Last Post 
Precision Power PC2600.2 PPI overcurrent proteciont  mikef1897  Car Audio  0  14th June 2006 11:02 AM 
How fast are 'Fast Fuse' and how to identify?  bigpanda  Solid State  7  22nd March 2005 10:00 PM 
comparator  audiokraut  Solid State  8  15th November 2004 06:44 AM 
Transistor Comparator ?  thylantyr  Solid State  9  9th April 2003 04:29 AM 
New To Site?  Need Help? 